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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795196ecf0817b09f25f856d96dccb3a106cd0a873e996f0c76cd47bed69428f' 
  AND token = 'i96El+EB3zajcgf5uM42lUwGdPyFGUVeJNsg2Dw8iMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}